Practicing Math and Number Theory
In a downtown building, there are 6 floors and the number of rooms on each floor is R. If each room has exactly C chairs, which of the following gives the total number of chairs in the building?
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SAT Math Review
Growth Problems: For LINEAR GROWTH, y always changes by the same amount when x changes by the same amount. Example: Each successive year, $100 is added to the value of the account. For EXPONENTIAL GROWTH, y increases by more and more as x increases by the same amount. Examples: A stock doubles in value every[…]
Facts to Know for ACT Science Section
Definitions for Chemistry Labs: – Solution = liquid mixture – Titrant = solution of a known concentration. Use a burette to put the titrant into a solution (in a beaker). – Solute = minor component that is uniformly distributed in the solvent – Solvent = major component that contains the solute – Precipitate = insoluble[…]
Definitions for ACT Science
Did you know? The ACT has a science section that tests skills such as analyzing scientific observations. Freezing: the substance changes from a liquid to a solid. Melting: the substance changes from the solid to the liquid. Condensation: the substances changes from a gas to a liquid. Vaporization: the substance changes from a liquid to[…]
Studying for the ACT Science Section
Did you know? These are some basics of chemistry that are important to know for the ACT Science section. Elements: – Na = sodium – K = potassium – Ca = calcium – Mg = magnesium – C = carbon – Al = aluminum – S = sulfur – Cl = chlorine – O =[…]
Essentials for ACT Science
Below are a few of the most commonly known compounds: Glucose – C6H12O6 Hydrochloric acid – HCl Water – H2O Salt – NaCl Octane – C8H18 Baking soda – NaHCO3 Hydrogen peroxide – H2O2
Balancing Chemistry Equations for ACT Science
CH4 + 2O2 –> CO2 + 2H2O Left hand side: 1 C, 4 H, 4 O Right hand side: 1 C, 4 H, 4 O
Important Equations Involving Percents
These equations are important for SAT and ACT math. – Percent change: (new-old)/old * 100 – Percent error: (experimental-theoretical)/theoretical *. 100
Physics for ACT Science
Total mechanical energy = kinetic energy + potential energy Mechanical energy is the sum of kinetic and potential energy in an object that is used to do work. It’s the energy in an object due to its motion or position. KE = 0.5mv^2 PE (energy stored in an object) = mass*g*height [g = acceleration due[…]
Chemistry and Physics on ACT Science
Molar mass is measured in grams per mole. You may need to calculate molar mass of a compound. This info is found in the periodic table. Example: NaCl has a molar mass of 58.35 (22.9+35.45) Na:22.9 Cl:35.45